Hosting website on jboss

currently i want to hosting a website on jboss.
i have JBoss 4.0.5.ga, bind9 (dns server) and jdk1.6.0_20

web app run on deployment dir.
-shopping.war

registered domain names
--letbuy.com

I want to access the web apps by www.letbuy.com / let'sbuy.com and it could acccess from my machine, internal network and from outside network.

C:\jboss-4.0.5.GA\server\default\deploy\letbuy.war\WEB-INF

i have start the bin9 service and jboss...but still could not access the web application.
really appreciate if you guys could help me out.
maybe i'm not clear enough with this since i'm new to web apps